Abstract

We investigate femtosecond pulse propagation in a medium containing nanorods, taking into account the dependence of two-photon absorption from the aspect ratio of nanorods. Using density matrix formalism, we derive a set of equations describing this process. We consider two cases: formation of a pure absorption grating and formation of both absorption and refraction gratings. Under weak absorption we discovered the acceleration of light or slowing of light (fast light or slow light) in comparison with light propagation in a linear medium. Using spatial-temporal analogy, one can see that this phenomenon is similar to the displacement of the laser beam center in the moving medium under thermal response or under thermal response and evaporation of clouds and fogs if the direction of their motion is perpendicular to the direction of the incident laser beam. We also found out the soliton formation under small nonlinear absorption on the dispersion length.

© 2015 Optical Society of America

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